Search for pre-main-sequence stars in the young galactic cluster NGC 6910

Citation
Aj. Delgado et Ej. Alfaro, Search for pre-main-sequence stars in the young galactic cluster NGC 6910, ASTRONOM J, 119(4), 2000, pp. 1848-1854
Citations number
30
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMICAL JOURNAL
ISSN journal
00046256 → ACNP
Volume
119
Issue
4
Year of publication
2000
Pages
1848 - 1854
Database
ISI
SICI code
0004-6256(200004)119:4<1848:SFPSIT>2.0.ZU;2-3
Abstract
Photometric CCD UBV measurements have been obtained in the held of the youn g Cygnus cluster NGC 6910. The observations reach down to magnitude V simil ar or equal to 18 for 206 stars measured in all three UBV bands, uncovering the region of the color-magnitude diagram where pre-main-sequence (PMS) st ars are expected. The transformation of our instrumental magnitudes to the standard system is discussed on the basis of two different sets of standard stars: 22 stars from six fields in the Landolt catalogs and 48 stars with published photoelectric photometry in common with ours in the four clusters observed in this campaign. The latter set is preferred, since it enables t he effect of systematic errors in the U-B colors to be minimized. The adopt ed cluster parameters are E(B-V) = 1.02 +/- 0.13, V-0 - M-V = 11.2 +/- 0.2, and age = (6.5 +/- 3) x 10(6) yr. The search for PMS cluster members on th e basis of the calculated color excess and distance modulus results in the proposed membership for 11 PMS stars of spectral types from A to G.